body{
    background-attachment:fixed;
    background-color:#777;
    background-size: cover;
    background-repeat:no-repeat;
    font-family:Helvetica Neue,Microsoft Yahei,Hiragino Sans GB,Microsoft Sans Serif,WenQuanYi Micro Hei,sans-serif;
    background-image: url(../image/bg.jpg);
}
.nav li a{
    color: #da6426;
    margin-top: 2px;
    padding: 10px 10px;
}
.nav li a:hover{
    background-color: rgba(30, 30, 30, 0.5);
}
/*定义导航条底部外边距为40px，颜色为黑色，透明度为0.3*/
.navbar-my{
    background-color:rgba(0,0,0,.3);
    margin-bottom: 40px;
}
/*定义导航链接的布局方式*/
.navbar-nav{
    margin: 0 auto;
    display: table;
    table-layout: fixed;
    float: none;
}
.navbar-my .navbar-toggle:hover,.navbar-my .navbar-toggle:focus {
    /*background-color:transparent*/
}
.navbar-my .navbar-toggle .icon-bar{
    background-color:#fff
}
.navbar-my .navbar-nav>li>a
{
    color:#fff;
    text-align:center
}
.navbar-my .navbar-nav>li>a:hover,.navbar-my .navbar-nav>li>a:focus{
    color:#fff;
    background-color:rgba(0,0,0,.4)
}
.navbar-my .navbar-nav>.active>a,.navbar-ghost .navbar-nav>.active>a:hover,.navbar-my .navbar-nav>.active>a:focus {
    color:#fff;
    background-color:rgba(0,0,0,.5)
}

.grow-rotate {
    display: inline-block;
    -webkit-transition-duration: 0.3s;
    transition-duration: 0.3s;
    -webkit-transition-property: transform;
    transition-property: transform;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    box-shadow: 0 0 1px rgba(0, 0, 0, 0);
}
.grow-rotate:hover, .grow-rotate:focus, .grow-rotate:active {
    -webkit-transform: scale(1.1) rotate(4deg);
    transform: scale(1.1) rotate(4deg);
}